Here is the full list of all 49 99 Spirits achievements.
Complete Chapter Three
Win 100 Battles
Reach Level 10
Sell 50 Items
Running Is a Victory
Amass a Fortune of 20.000
For Big Eaters
Complete Chapter Two
Complete Chapter One
Defeat the First Boss Without Using Items
Identify an Enemy Without Any Hints
Learn All You Can Before Setting Out
Wake up Dozing Hanabusa
Win a Battle Without Missing a Single Counter
Complete Chapter Four
Complete Chapter Five
Complete Chapter Six
Complete Chapter Seven
Complete Chapter Eight
Complete Chapter Nine
Complete Chapter Ten
Complete Chapter Eleven
Win a Gamble
Win 500 in a Single Gamble
Free an Area from Evil Influence
Free the World from Evil Influence
Pay Your Respects
Get to Know the Monk
Get to Know the Merchant
Travel 5000 Steps
Reach Level 20
Reach Level 30
Reach Level 40
Reach Level 50
"Acquire" a Mystical Item
Vanquish a Great Monster
Vanquish all Great Monsters that Roam the Land
Amass a Fortune of 100.000
Save a Damsel in Distress
Walk a Tranquil Path
Walk the Path of Asura
Find All Stone Statues in a Single Playthrough
Index All Tsukumogami
Receive the Spirits' Blessing
For Those Who Reached the End
For Those Who Saw It All
Maximum Utility, No Nonsense
Master a Tsukumogami
Show Proof of Mastering the Use of Gems